leave audio params at default to see if it addresses safari playback issues

src/components/VoiceRecorder.vue

@@ -345,9 +345,6 @@ export default {
           this.recorder = RecordRTC(stream, {
             type: "audio",
             mimeType: "audio/webm",
-            sampleRate: 16000,
-            desiredSampRate: 16000,
-            numberOfAudioChannels: 1,
           });
           this.recorder.startRecording();
           this.state = State.RECORDING;
@@ -477,4 +474,4 @@ export default {
 .fade-enter, .fade-leave-to /* .fade-leave-active below version 2.1.8 */ {
   opacity: 0;
 }
-</style> 
+</style>